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  #1  
Old 03-22-2019, 11:55 AM
100fathomline 100fathomline is offline
 
Join Date: Jun 2013
Location: Tucson,AZ
Posts: 1
Default What if a flaperon weld broke?

Has anyone considered what would happen if, on a RV-12, the weld broke which connects the torque tube to a flaperon. With just a small area of weld, itís always been a worry to me and is closely inspected before each flight.

In thinking about it, at a high enough speed, the loose flaperon might stream inline with the wing and movement up and down of the operating flaperon might provide sufficient flight control for a high speed landing. Thoughts anyone?
Gary in Tucson
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  #2  
Old 03-24-2019, 12:02 AM
rcarsey rcarsey is offline
 
Join Date: Jul 2012
Location: North Brunswick, NJ
Posts: 129
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I've been wondering the same thing actually..

One of two things would happen .. it would either find its own happy position for the amount of air flowing around the wing and the AOA.. or it will flap around like a loose fish on a boat.

My guess is that it would have the same behavior as if you were flying and took your hand off the stick. You'd still have control over the other aileron and I guess have only half of the roll authority as normal. So things may get a little dicey as you flare or in gusty crosswinds.
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  #3  
Old 03-24-2019, 04:44 PM
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Piper J3 Piper J3 is offline
 
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My guess is the flaperon with the broken weld would probably trail in the slip stream. The problem would be with the other wing with the "working" flaperon. Here would have drag from the working control surface not countered by the opposite wing. Some degree of adverse yaw would be present and would be difficult to deal with...
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PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 490

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  #4  
Old 03-25-2019, 09:07 AM
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Piper J3 Piper J3 is offline
 
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Another idea to satisfy your curiosityÖ fly a radio-control low-wing airplane that has individual servos controlling the ailerons. Program a switch on your transmitter so you can shut off one aileron servo in flight. In level flight, with normal power, shut off one aileron servo and see what happens. Wonít be pretty.
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Jim Stricker
Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 490

LSRM-A Certificate 2016
Special Thanks... EJ Trucks - Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - 1st Lt. Captain B-17H
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  #5  
Old 03-26-2019, 11:31 AM
NORM T NORM T is offline
 
Join Date: Feb 2019
Location: Dallas, OR
Posts: 8
Default What if a flaperon weld failed?

Quote:
Originally Posted by 100fathomline View Post
Has anyone considered what would happen if, on a RV-12, the weld broke which connects the torque tube to a flaperon. With just a small area of weld, itís always been a worry to me and is closely inspected before each flight.

In thinking about it, at a high enough speed, the loose flaperon might stream inline with the wing and movement up and down of the operating flaperon might provide sufficient flight control for a high speed landing. Thoughts anyone?
Gary in Tucson
Gary, I hope you do not have the missing welds as referenced in "Service Alert RV-12 (3-17-11) which indicated some flaperon torque arms were tack welded only. Please check for the indicated full welds, not tack welds!
Norm
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  #6  
Old 03-26-2019, 12:28 PM
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joedallas joedallas is offline
 
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Location: Spring Hill Fl
Posts: 723
Default The link

The Link
https://www.vansaircraft.com/service...s/sa-03-17-11/

Joe Dallas

Quote:
Originally Posted by NORM T View Post
Gary, I hope you do not have the missing welds as referenced in "Service Alert RV-12 (3-17-11) which indicated some flaperon torque arms were tack welded only. Please check for the indicated full welds, not tack welds!
Norm
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  #7  
Old 03-26-2019, 12:36 PM
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N941WR N941WR is offline
 
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Location: SC
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I recently performed a Tech Inspection on a -12 and realized that the builder did not treat that bell crank before installing it.

Apparently the plans don't mention it needs to be painted before installation.

If any of you find an untreated bell crank in your plane, remove any surface rust you find and paint it. A paint brush will work.
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  #8  
Old 03-26-2019, 01:44 PM
Bob Y Bob Y is online now
 
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Location: Piedmont, SC
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Quote:
Originally Posted by N941WR View Post
I recently performed a Tech Inspection on a -12 and realized that the builder did not treat that bell crank before installing it.

Apparently the plans don't mention it needs to be painted before installation
Bill is referring to the WD-01224 FLAP CRANK assembly installation on KAI page 32iS/U-08.
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  #9  
Old 03-26-2019, 09:28 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,509
Talking

In plain terms you might be VSF! Watch Air America for an explanation.
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